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12+0.60=21x
We move all terms to the left:
12+0.60-(21x)=0
We add all the numbers together, and all the variables
-21x+12.6=0
We move all terms containing x to the left, all other terms to the right
-21x=-12.6
x=-12.6/-21
x=3.5/5.8333333333333
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